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This approach involves splitting the original string into individual words using space as a delimiter, reversing the list of words, and then joining them back together with a single space.
Time Complexity: O(N), where N is the length of the string, as we process each character once.
Space Complexity: O(N), additional space for intermediate and result storage.
1using System;
2
3public class Solution {
4 public static string ReverseWords(string s) {
5 string[] words = s.Trim().Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries);
6 Array.Reverse(words);
7 return string.Join(" ", words);
8 }
9
10 public static void Main() {
11 string input = " hello world ";
12 string output = ReverseWords(input);
13 Console.WriteLine(output);
14 }
15}In C#, the solution employs Trim() to handle spaces and Split() to handle empty substrings when splitting. The Array.Reverse() is used for reversing the split words before joining them with a space as the delimiter.
This optimized approach manipulates the string in place by using a character array. We'll first reverse the entire string, and then reverse each word to return them to their correct order.
Time Complexity: O(N), where N is the number of characters in the string.
Space Complexity: O(1), as the operation is done in-place without extra space.
1
This C solution reverses the string in place using a helper function reverseCharArray. It then iterates over the string, reversing individual words and reconstructing the string without additional leading or trailing spaces.